<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * @package	CodeIgniter
 * @author	EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
 * @copyright	Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 1.0.0
 * @filesource
 */
defined ( 'BASEPATH' ) or exit ( 'No direct script access allowed' );

/**
 * URI Class
 *
 * Parses URIs and determines routing
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	URI
 * @author		EllisLab Dev Team
 * @link		https://codeigniter.com/user_guide/libraries/uri.html
 */
class CI_URI {

	/**
	 * List of cached URI segments
	 *
	 * @var	array
	 */
	public $keyval = array ();

	/**
	 * Current URI string
	 *
	 * @var	string
	 */
	public $uri_string = '';

	/**
	 * List of URI segments
	 *
	 * Starts at 1 instead of 0.
	 *
	 * @var	array
	 */
	public $segments = array ();

	/**
	 * List of routed URI segments
	 *
	 * Starts at 1 instead of 0.
	 *
	 * @var	array
	 */
	public $rsegments = array ();

	/**
	 * Permitted URI chars
	 *
	 * PCRE character group allowed in URI segments
	 *
	 * @var	string
	 */
	protected $_permitted_uri_chars;

	/**
	 * Class constructor
	 *
	 * @return	void
	 */
	public function __construct() {
		$this->config = & load_class ( 'Config', 'core' );

		// If query strings are enabled, we don't need to parse any segments.
		// However, they don't make sense under CLI.
		if (is_cli () or $this->config->item ( 'enable_query_strings' ) !== TRUE) {
			$this->_permitted_uri_chars = $this->config->item ( 'permitted_uri_chars' );

			// If it's a CLI request, ignore the configuration
			if (is_cli ()) {
				$uri = $this->_parse_argv ();
			} else {
				$protocol = $this->config->item ( 'uri_protocol' );
				empty ( $protocol ) && $protocol = 'REQUEST_URI';

				switch ($protocol) {
					case 'AUTO' : // For BC purposes only
					case 'REQUEST_URI' :
						$uri = $this->_parse_request_uri ();
						break;
					case 'QUERY_STRING' :
						$uri = $this->_parse_query_string ();
						break;
					case 'PATH_INFO' :
					default :
						$uri = isset ( $_SERVER [$protocol] ) ? $_SERVER [$protocol] : $this->_parse_request_uri ();
						break;
				}
			}
			$this->_set_uri_string ( $uri );
		}

		log_message ( 'info', 'URI Class Initialized' );
	}

	// --------------------------------------------------------------------


	/**
	 * Set URI String
	 *
	 * @param 	string	$str
	 * @return	void
	 */
	protected function _set_uri_string($str) {

		// Filter out control characters and trim slashes
		$this->uri_string = trim ( remove_invisible_characters ( $str, FALSE ), '/' );

		if ($this->uri_string !== '') {
			// Remove the URL suffix, if present
			if (($suffix = ( string ) $this->config->item ( 'url_suffix' )) !== '') {
				$slen = strlen ( $suffix );

				if (substr ( $this->uri_string, - $slen ) === $suffix) {
					$this->uri_string = substr ( $this->uri_string, 0, - $slen );
				}
			}
			$this->segments [0] = NULL;
			// Populate the segments array
			foreach ( explode ( '/', trim ( $this->uri_string, '/' ) ) as $val ) {
				$val = trim ( $val );
				// Filter segments for security
				$this->filter_uri ( $val );

				if ($val !== '') {
					$this->segments [] = $val;
				}
			}

			unset ( $this->segments [0] );
		}
	}

	// --------------------------------------------------------------------


	/**
	 * Parse REQUEST_URI
	 *
	 * Will parse REQUEST_URI and automatically detect the URI from it,
	 * while fixing the query string if necessary.
	 *
	 * @return	string
	 */
	protected function _parse_request_uri() {
		if (! isset ( $_SERVER ['REQUEST_URI'], $_SERVER ['SCRIPT_NAME'] )) {
			return '';
		}
		require_once BASEPATH . "helpers/public_helper.php";
		// parse_url() returns false if no host is present, but the path or query string
		// contains a colon followed by a number
		$uri = parse_url ( 'http://dummy' . $_SERVER ['REQUEST_URI'] );
		$query = isset ( $uri ['query'] ) ? $uri ['query'] : '';
		$query_getstring =isset ( $uri ['query'] ) ? $uri ['query'] : '';
		if ($query_getstring) {
			$_tmparr = explode( '&', $query_getstring );
			foreach ( $_tmparr as $_tmparr_val ) {
				$_tmparr_keyvalue = explode ( '=', $_tmparr_val );
				$_GET [$_tmparr_keyvalue [0]] = $_tmparr_keyvalue [1];
			}
		}

		$querystring = $_SERVER ['REQUEST_URI'];
        if(strstr($querystring, '/?')){
        	$querystring = str_replace ( '/?', '', $querystring );
        }else{
        	$querystring = str_replace ( '/index.php?', '', $querystring );
        }
		$pos = strrpos ( $querystring, '.' );
		if ($pos !== false) {
			$querystring = substr ( $querystring, 0, $pos );
		}

		/* 处理简短url */
		$pos = strpos ( $querystring, '-' );
		$pos2 = strpos ( $querystring, '=' );
		$pos3 = strpos ( $querystring, '/' );
		if ($pos !== false) {
			$tempmaparr = explode ( '-', $querystring ); //拆分参数
			//如果不是标签方式就进行判断
			if ($tempmaparr [0] !== 'tag' && $tempmaparr [0] !== 'topictag') {
				//判断最后一个值是否为整形
				if (is_numeric ( $tempmaparr [1] )) {
					$querystring = urlmap ( $querystring );
				} else {
					//如果不是不做处理转换
					$querystring = urlmap ( $querystring, 2 );
				}
			} else {

				//如果是标签方式就进行处理
				$querystring = urlmap ( $querystring );
			}
		}

		($pos2 !== false) && $querystring = urlmap ( $querystring );
		($pos3 !== false) && $querystring = urlmap ( $querystring );
		$andpos = strpos ( $querystring, "&" );
		$andpos && $querystring = substr ( $querystring, 0, $andpos );
		$query = $querystring;
		$uri = $querystring; //isset($uri['path']) ? $uri['path'] : '';


		if (isset ( $_SERVER ['SCRIPT_NAME'] [0] )) {
			if (strpos ( $uri, $_SERVER ['SCRIPT_NAME'] ) === 0) {
				$uri = ( string ) substr ( $uri, strlen ( $_SERVER ['SCRIPT_NAME'] ) );
			} elseif (strpos ( $uri, dirname ( $_SERVER ['SCRIPT_NAME'] ) ) === 0) {
				$uri = ( string ) substr ( $uri, strlen ( dirname ( $_SERVER ['SCRIPT_NAME'] ) ) );
			}
		}

		// This section ensures that even on servers that require the URI to be in the query string (Nginx) a correct
		// URI is found, and also fixes the QUERY_STRING server var and $_GET array.
		if (trim ( $uri, '/' ) === '') {
			$query = explode ( '?', $query, 2 );
			$uri = $query [0];
			$_SERVER ['QUERY_STRING'] = isset ( $query [1] ) ? $query [1] : '';
		} else {
			$_SERVER ['QUERY_STRING'] = $query;
		}



		if ($uri === '/' or $uri === '') {
			return '/';
		}
		$uri = str_replace ( '/?', '', $uri );

		// Do some final cleaning of the URI and return it
		return $this->_remove_relative_directory ( $uri );
	}

	// --------------------------------------------------------------------


	/**
	 * Parse QUERY_STRING
	 *
	 * Will parse QUERY_STRING and automatically detect the URI from it.
	 *
	 * @return	string
	 */
	protected function _parse_query_string() {
		$uri = isset ( $_SERVER ['QUERY_STRING'] ) ? $_SERVER ['QUERY_STRING'] : @getenv ( 'QUERY_STRING' );
		if (trim ( $uri, '/' ) === '') {
			return '';
		} elseif (strncmp ( $uri, '/', 1 ) === 0) {
			$uri = explode ( '?', $uri, 2 );
			$_SERVER ['QUERY_STRING'] = isset ( $uri [1] ) ? $uri [1] : '';
			$uri = $uri [0];
		}

		parse_str ( $_SERVER ['QUERY_STRING'], $_GET );

		return $this->_remove_relative_directory ( $uri );
	}

	// --------------------------------------------------------------------


	/**
	 * Parse CLI arguments
	 *
	 * Take each command line argument and assume it is a URI segment.
	 *
	 * @return	string
	 */
	protected function _parse_argv() {
		$args = array_slice ( $_SERVER ['argv'], 1 );
		return $args ? implode ( '/', $args ) : '';
	}

	// --------------------------------------------------------------------


	/**
	 * Remove relative directory (../) and multi slashes (///)
	 *
	 * Do some final cleaning of the URI and return it, currently only used in self::_parse_request_uri()
	 *
	 * @param	string	$uri
	 * @return	string
	 */
	protected function _remove_relative_directory($uri) {
		$uris = array ();
		$tok = strtok ( $uri, '/' );
		while ( $tok !== FALSE ) {
			if ((! empty ( $tok ) or $tok === '0') && $tok !== '..') {
				$uris [] = $tok;
			}
			$tok = strtok ( '/' );
		}

		return implode ( '/', $uris );
	}

	// --------------------------------------------------------------------


	/**
	 * Filter URI
	 *
	 * Filters segments for malicious characters.
	 *
	 * @param	string	$str
	 * @return	void
	 */
	public function filter_uri(&$str) {
		if (! empty ( $str ) && ! empty ( $this->_permitted_uri_chars ) && ! preg_match ( '/^[' . $this->_permitted_uri_chars . ']+$/i' . (UTF8_ENABLED ? 'u' : ''), $str )) {
			show_error ( $str . 'The URI you submitted has disallowed characters.', 400 );
		}
	}

	// --------------------------------------------------------------------


	/**
	 * Fetch URI Segment
	 *
	 * @see		CI_URI::$segments
	 * @param	int		$n		Index
	 * @param	mixed		$no_result	What to return if the segment index is not found
	 * @return	mixed
	 */
	public function segment($n, $no_result = NULL) {
		return isset ( $this->segments [$n] ) ? $this->segments [$n] : $no_result;
	}

	// --------------------------------------------------------------------


	/**
	 * Fetch URI "routed" Segment
	 *
	 * Returns the re-routed URI segment (assuming routing rules are used)
	 * based on the index provided. If there is no routing, will return
	 * the same result as CI_URI::segment().
	 *
	 * @see		CI_URI::$rsegments
	 * @see		CI_URI::segment()
	 * @param	int		$n		Index
	 * @param	mixed		$no_result	What to return if the segment index is not found
	 * @return	mixed
	 */
	public function rsegment($n, $no_result = NULL) {
		return isset ( $this->rsegments [$n] ) ? $this->rsegments [$n] : $no_result;
	}

	// --------------------------------------------------------------------


	/**
	 * URI to assoc
	 *
	 * Generates an associative array of URI data starting at the supplied
	 * segment index. For example, if this is your URI:
	 *
	 * example.com/user/search/name/joe/location/UK/gender/male
	 *
	 * You can use this method to generate an array with this prototype:
	 *
	 * array (
	 * name => joe
	 * location => UK
	 * gender => male
	 * )
	 *
	 * @param	int	$n		Index (default: 3)
	 * @param	array	$default	Default values
	 * @return	array
	 */
	public function uri_to_assoc($n = 3, $default = array()) {
		return $this->_uri_to_assoc ( $n, $default, 'segment' );
	}

	// --------------------------------------------------------------------


	/**
	 * Routed URI to assoc
	 *
	 * Identical to CI_URI::uri_to_assoc(), only it uses the re-routed
	 * segment array.
	 *
	 * @see		CI_URI::uri_to_assoc()
	 * @param 	int	$n		Index (default: 3)
	 * @param 	array	$default	Default values
	 * @return 	array
	 */
	public function ruri_to_assoc($n = 3, $default = array()) {
		return $this->_uri_to_assoc ( $n, $default, 'rsegment' );
	}

	// --------------------------------------------------------------------


	/**
	 * Internal URI-to-assoc
	 *
	 * Generates a key/value pair from the URI string or re-routed URI string.
	 *
	 * @used-by	CI_URI::uri_to_assoc()
	 * @used-by	CI_URI::ruri_to_assoc()
	 * @param	int	$n		Index (default: 3)
	 * @param	array	$default	Default values
	 * @param	string	$which		Array name ('segment' or 'rsegment')
	 * @return	array
	 */
	protected function _uri_to_assoc($n = 3, $default = array(), $which = 'segment') {
		if (! is_numeric ( $n )) {
			return $default;
		}

		if (isset ( $this->keyval [$which], $this->keyval [$which] [$n] )) {
			return $this->keyval [$which] [$n];
		}

		$total_segments = "total_{$which}s";
		$segment_array = "{$which}_array";

		if ($this->$total_segments () < $n) {
			return (count ( $default ) === 0) ? array () : array_fill_keys ( $default, NULL );
		}

		$segments = array_slice ( $this->$segment_array (), ($n - 1) );
		$i = 0;
		$lastval = '';
		$retval = array ();
		foreach ( $segments as $seg ) {
			if ($i % 2) {
				$retval [$lastval] = $seg;
			} else {
				$retval [$seg] = NULL;
				$lastval = $seg;
			}

			$i ++;
		}

		if (count ( $default ) > 0) {
			foreach ( $default as $val ) {
				if (! array_key_exists ( $val, $retval )) {
					$retval [$val] = NULL;
				}
			}
		}

		// Cache the array for reuse
		isset ( $this->keyval [$which] ) or $this->keyval [$which] = array ();
		$this->keyval [$which] [$n] = $retval;
		return $retval;
	}

	// --------------------------------------------------------------------


	/**
	 * Assoc to URI
	 *
	 * Generates a URI string from an associative array.
	 *
	 * @param	array	$array	Input array of key/value pairs
	 * @return	string	URI string
	 */
	public function assoc_to_uri($array) {
		$temp = array ();
		foreach ( ( array ) $array as $key => $val ) {
			$temp [] = $key;
			$temp [] = $val;
		}

		return implode ( '/', $temp );
	}

	// --------------------------------------------------------------------


	/**
	 * Slash segment
	 *
	 * Fetches an URI segment with a slash.
	 *
	 * @param	int	$n	Index
	 * @param	string	$where	Where to add the slash ('trailing' or 'leading')
	 * @return	string
	 */
	public function slash_segment($n, $where = 'trailing') {
		return $this->_slash_segment ( $n, $where, 'segment' );
	}

	// --------------------------------------------------------------------


	/**
	 * Slash routed segment
	 *
	 * Fetches an URI routed segment with a slash.
	 *
	 * @param	int	$n	Index
	 * @param	string	$where	Where to add the slash ('trailing' or 'leading')
	 * @return	string
	 */
	public function slash_rsegment($n, $where = 'trailing') {
		return $this->_slash_segment ( $n, $where, 'rsegment' );
	}

	// --------------------------------------------------------------------


	/**
	 * Internal Slash segment
	 *
	 * Fetches an URI Segment and adds a slash to it.
	 *
	 * @used-by	CI_URI::slash_segment()
	 * @used-by	CI_URI::slash_rsegment()
	 *
	 * @param	int	$n	Index
	 * @param	string	$where	Where to add the slash ('trailing' or 'leading')
	 * @param	string	$which	Array name ('segment' or 'rsegment')
	 * @return	string
	 */
	protected function _slash_segment($n, $where = 'trailing', $which = 'segment') {
		$leading = $trailing = '/';

		if ($where === 'trailing') {
			$leading = '';
		} elseif ($where === 'leading') {
			$trailing = '';
		}

		return $leading . $this->$which ( $n ) . $trailing;
	}

	// --------------------------------------------------------------------


	/**
	 * Segment Array
	 *
	 * @return	array	CI_URI::$segments
	 */
	public function segment_array() {
		return $this->segments;
	}

	// --------------------------------------------------------------------


	/**
	 * Routed Segment Array
	 *
	 * @return	array	CI_URI::$rsegments
	 */
	public function rsegment_array() {
		return $this->rsegments;
	}

	// --------------------------------------------------------------------


	/**
	 * Total number of segments
	 *
	 * @return	int
	 */
	public function total_segments() {
		return count ( $this->segments );
	}

	// --------------------------------------------------------------------


	/**
	 * Total number of routed segments
	 *
	 * @return	int
	 */
	public function total_rsegments() {
		return count ( $this->rsegments );
	}

	// --------------------------------------------------------------------


	/**
	 * Fetch URI string
	 *
	 * @return	string	CI_URI::$uri_string
	 */
	public function uri_string() {
		return $this->uri_string;
	}

	// --------------------------------------------------------------------


	/**
	 * Fetch Re-routed URI string
	 *
	 * @return	string
	 */
	public function ruri_string() {
		return ltrim ( load_class ( 'Router', 'core' )->directory, '/' ) . implode ( '/', $this->rsegments );
	}

}
